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Uniform Preferential Selection Model for Generating Scale-free Networks

Author

Listed:
  • Raheel Anwar

    (Karl Franzens Universität)

  • Muhammad Irfan Yousuf

    (Member IEEE)

  • Muhammad Abid

    (Pakistan Institute of Engineering and Applied Sciences)

Abstract

It has been observed in real networks that the fraction of nodes P(k) with degree k satisfies the power-law P(k) ∝ k−γ for k > kmin > 0. However, the degree distribution of nodes in these networks before kmin varies slowly to the extent of being uniform as compared to the degree distribution after kmin. Most of the previous studies focus on the degree distribution after kmin and ignore the initial flatness in the distribution of degrees. In this paper, we propose a model that describes the degree distribution for the whole range of k > 0, i.e., before and after kmin. The network evolution is made up of two steps. In the first step, a new node is connected to the network through a preferential attachment method. In the second step, a certain number of edges between the existing nodes are added such that the end nodes of an edge are selected either uniformly or preferentially. The model has a parameter to control the uniform or preferential selection of nodes for creating edges in the network. We perform a comprehensive mathematical analysis of our proposed model in the discrete domain and prove that the model exhibits an asymptotically power-law degree distribution after kmin and a flat-ish distribution before kmin. We also develop an algorithm that guides us in determining the model parameters in order to fit the model output to the node degree distribution of a given real network. Our simulation results show that the degree distributions of the graphs generated by this model match well with those of the real-world graphs.

Suggested Citation

  • Raheel Anwar & Muhammad Irfan Yousuf & Muhammad Abid, 2022. "Uniform Preferential Selection Model for Generating Scale-free Networks," Methodology and Computing in Applied Probability, Springer, vol. 24(1), pages 449-470, March.
    • Handle: RePEc:spr:metcap:v:24:y:2022:i:1:d:10.1007_s11009-021-09854-w
    DOI: 10.1007/s11009-021-09854-w
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    References listed on IDEAS

    as
    1. Panpan Zhang & Hosam M. Mahmoud, 2020. "On Nodes of Small Degrees and Degree Profile in Preferential Dynamic Attachment Circuits," Methodology and Computing in Applied Probability, Springer, vol. 22(2), pages 625-645, June.
    2. Steven H. Strogatz, 2001. "Exploring complex networks," Nature, Nature, vol. 410(6825), pages 268-276, March.
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